Across
- 2. number: the total number of protons and neutrons in a nucleus.
- 3. a part or aspect of something abstract, especially one that is essential or characteristic.
- 7. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen
- 8. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 9. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Down
- 1. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 2. anything that has volume and mass
- 4. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- 5. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
- 6. number: a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.